One color people have difficulty finding for my workshops is Quin Gold. It has been renamed Quinacridone/Nickel Azo Gold, and it is made by Golden. Don't be confused into thinking that this is a metalic paint....it ain't. It is crucial in creating some of the effects of aging (not refering to my rapidly graying hair). I mix it with just about everything. You can order it from Golden direct or you can usually find it at Michaels or other large art stores. http://www.goldenpaints.com/products/color/heavybody/colors/1301infopg.php
Also...begining late Spring...I'll be selling paint kits that have all the colors I use to create different looks.